#include <stdio.h>
//練習問題G
int func(int n){
int a=1, b=2, c;
int i;
if (n == 1){
return a;
}
if (n == 2){
return 2;
}
for(i=3;i<=n;i++){
c=2*a-2*b;
a=b;
b=c;
}
return b;
}
int main(void) {
int n = 3;
printf("数列anについて, n=%dのときの値は%d\n", n
, func
(n
)); return 0;
}
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